So can any [good] scribe back home.

The protagonist one of royal family members of Amber, who are half-immortal.
He saw his great grandfather Dworkin come and go.
And just now his grandfather Oberon appeared before him.
Nobody has seen them for so very long time.

"I understand that Oberon died in redrawing the Pattern," I said.
"Were you present at the time?" he asked.
"No," I replied, "but coming as you do, on the heels of a rather bizarre apparition of Dworkin, you must excuse my suspicions as to your bona fides."
"Oh, that was a fake you encountered, I'm the real thing."
............
"I can recite the entire genealogy of the royal House of Amber."
"So can any good scribe back home."
"I'll throw in the illegitimates."
["Knight of Shadows" of The Great Book of Amber by Roger Zelazny]
I was wondering why it is "good," not "enough."
Thank you in advance for your help.